| 摘要 |
Nozzle apparatus for abrasively cleaning structures comprises an inlet (48) for a sand and water mixture, the inlet communicating with a chamber (42) leading to a nozzle (43). To improve the cleaning action a compressed air feed (45) is used feeding a nozzle (47) having an outlet (46) positioned coaxially about the outlet of nozzle (43). In this arrangement the jet of water with entrained sand is surrounded by a high velocity jet of air providing an improved cleaning action. |
